What is the probability that a random sample of 50 individuals shows an average annual income of at least $50,000? Select the parameters of the distribution to calculate the probability:

E (x), σx

Step-by-step explanation:

We have to x be their average annual income we need to find p (x = > 50000)

To find this probability we need E (x), σx

For we find p (x = > 50000) we find the z value for 50000, ie the # of standart deviations that 50000 is away form E (x)

z = (x - E (x) / σx)

now p (x = > 50000) = p (z = > (x - E (x) / σx)

hence we can say that, to find p (x = > 50000) we need the parameters E (x), σx